function hideLeft(){

	var mark = document.menuForm.hidHead.value;
	if (mark=="hide"){
		document.menuForm.hidHead.value='display'
		document.all("menuTd").style.display="none"
		document.all("hideLeftImg").src="../images/rightArrow.gif"
	}else{
		document.menuForm.hidHead.value='hide'
		document.all("menuTd").style.display=""
		document.all("hideLeftImg").src="../images/leftArrow.gif"
	}
}
